Drill-support



.DRILL SUPPORT.

N 263 008 Patnted Aug. 22, 1882.

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CHRISTOPHER WHEN, OF PLYMOUTH, PENNSYLVANIA.

DRILL-SUPPO RT.

SPECIFICATION forming part of Letters Patent No. 263,008, dated August 22, 1882.

Application led May 27, 1882. (Model.)

To all whom it may concern Be it known that I, CHRISTOPHER WREN, ot' Plymouth, in the county of Luzerne and State of Pennsylvania, have invented a new and Improved Drilling-Machine, of which the following is a specification, reference being had to the accompanying drawings.

Figure lis a side view, showing the parts in position for operation. Fig. 2 is also a side view. Fig. 3 is an end view on the broken lines Z Z and X X, Fig. 1. Fig. 4 is an end view on the line YY, Fig. l. Fig. 5 is the wedge L, side and end views.

Similar letters refer to similar parts in all the views.

A is a hollow arm attached to O O by the coupling P.

Bis a movable box split on one side, and clamped to arm A by the screw J, having seats in it for the trunnions H H, and a small hole, J, which registers with holes Of like size in flange T, that a pin or key may pass through them.

O is a threaded box resting on the trunnions H H in box B, and having On its under side a semicrcular flange, T, in which are holes 'that register with the hole I in box B.

D D2 form anexpansib'le tube, which may be made either straightortapering, split lengthwise, fastened together On one side by the pin N, running through the hinges M M M M, and separated on the other side by a tapered opening, W, in which aregrooves It R, made to t the edge ofthe wedge L, having on their outer 'surface raised sharp-ed ged ribs K K K K, 8vo.,

and having on one end forked arms O O,which iit into the coupling P.

E is a twisted drill.

F is a plain screw workin g through the threaded box C, made on the ends to lit the sockets in crank G and drill E.

L is a tapered wedge sliding in the grooves It R, and concaved, so as to throw the strain in the direction indicated by the arrows in Fig. 3, being the point of greatest strength of metal.

Q, is the space, formed by D D2, through which the drill passes into the coal or other substance.

ping the box B sidewise.

Operation: The parts D D2 are placed in a hole which has been made, by hand-drill or otherwise, large enough to admit them when closed. The wedgeV L is then placed in the grooves R R and driven forward into the opening W. This expands the parts D' D2 and forces the sharp-edged ribs K K K K, 85o., into the surrounding-coal or other substance. The machine is thus held firmly toits place. In the operation of drilling the screw F is turned in the threaded box (l by means of the crank G. The thread in the box C feeds the screw F and the drill E, which is attached to screw F, forward into the substance being drilled. When the screw F has been fed forward as far as it will go the pin I is taken out, the trun` nions H H are uncoupled, and the screw F is turned end for end. It is then ready to start forward again. 1n case it is desirable to drill a hole outside of the space Q, it may be done by changing the pin I to another hole in the.

flange F, or by loosening the screw J an d dropchine a range anywhere in a circle of which the arm A is the center.

Iam aware that prior to my invention drillingmachines have been in use made with the twisted drill E and the screw F, operated by a crank, G. I therefore do not claim 4these parts, broadly; but

What I claim as new isl. The combination, in a drilling-machine fastening, of the expansible tube D D2, of which the hinges M M M- M, the pin N, the sharp-edged ribs K K K K, &c., the tapered opening W, and the grooves It R are compo` nentparts, with a tapered wedge, L, substantially as arranged and described..

2. The combination,ina drilling-machine, of the expansible tube Dl D2, the wedge L, and the hollow arm A with the adjustable box B and the flanged threaded box (l, all substantially as described and set forth.

CHRISTOPHER WEE N. 4

Witnesses: 4

C. W. MOALARNEY, HORATIO M. COLE.

This gives the ma- 

